I'm really simplifying this, but here goes.
Your brain develops throughout your life. I develops by forming connections between the brain cells. It forms connections based on experiences throughout life. Most of the brain develops before you get to middle school.
But not all of it.
The brain develops from back to front, generally speaking. The brain doesn't finish developing until you're about 21 or 22. The very last part to develop is in the front, the frontal lobe.
I'll leave you determine how important the frontal lobe is: It's the part of the brain primarily responsible for planning, decision-making, impulse control, and rational thought. When it is impaired, or not developed, sensory information gets routed through the emotional center of the brain.
So if you're been complaining lately that you're teenager seems to be operating with half a brain, you're partially right. Actually, s/he's operating with about 9/10 of a brain.
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